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v3.23.3

Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Amortization of pension and postretirement items | $ 0.7 |  |  | $ 0.4 |  |  | $ 3.1 | $ 3.3
Total before tax | 67.9 |  |  | 64.4 |  |  | 178.4 | 189.4
Tax impact | 16.0 |  |  | 19.8 |  |  | 39.6 | 46.5
Net income attributable to common shareholders | 51.9 | $ 43.2 | $ 43.7 | 44.6 | $ 48.8 | $ 49.5 | 138.8 | 142.9
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Plan |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Total before tax | (0.6) |  |  | (0.1) |  |  | (1.8) | (0.6)
Tax impact | (0.1) |  |  | (0.1) |  |  | (0.3) | (0.2)
Net income attributable to common shareholders | (0.5) |  |  | 0.0 |  |  | (1.5) | (0.4)
Pension | Reclassification out of Accumulated Other Comprehensive Income | Prior service costs |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Amortization of pension and postretirement items | (0.1) |  |  | (0.1) |  |  | (0.5) | (0.5)
Pension | Reclassification out of Accumulated Other Comprehensive Income | Net gain (loss) |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Amortization of pension and postretirement items | 0.0 |  |  | 0.3 |  |  | 0.0 | 0.7
Postretirement | Reclassification out of Accumulated Other Comprehensive Income | Prior service costs |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Amortization of pension and postretirement items | (0.3) |  |  | (0.3) |  |  | (0.8) | (0.8)
Postretirement | Reclassification out of Accumulated Other Comprehensive Income | Net gain (loss) |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |
Amortization of pension and postretirement items | $ (0.2) |  |  | $ 0.0 |  |  | $ (0.5) | $ 0.0

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